Doesn't Lasix Free Racing Help the Envelope Pushers?

I'm not a status-quo dude, obviously, and I do understand the push from the higher forehead crowd regarding lasix use in Thoroughbred racing, but sometimes I wonder.

• At its March meeting on Monday, the Kentucky Horse Racing Commission voted to approve a controversial measure that would allow the state’s racetracks to write Lasix-free races. The final vote was 8-4 in favor of the rule.
• The proposed rule would allow tracks to write one or more races with conditions precluding entrants from having Lasix within 24 hours of the race, in contrast to the current statewide rule which allows administration at four hours in advance of race time.

If you were a trainer who tries to get every edge possible, would you not be entering in these races? Lasix is a performance enhancer, and there are plenty of other things that can be, and are, used to stop bleeding and dehydrate horses. Sure, using these products on raceday is a no no, but without detention barns who'd know?